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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '297df9ce5e7d66306030b2cde72ea75d8827e15f2d949e4c3a92090028a9bd6f' 
  AND token = 'Fiah+p88OtbSOoDvg4hiq3YkJKYuuPRo5bStskWTovI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}